migrated custom timetable events to Marianum-Connect and refactored push notification handling

lib/push/push_message_handler.dart

@@ -77,15 +77,24 @@ class PushMessageHandler {
     String? openChatToken,
   }) async {
     final data = message.data;
+    // The device stays registered even when the user turns notifications off,
+    // so silent sync pushes (deletes, data refresh) keep arriving. When off we
+    // still process the message but skip raising a visible notification.
+    final notificationsEnabled = await _registrationStore.notificationsEnabled();
     switch (classifyPush(data)) {
       case PushKind.connect:
-        await _handleConnect(message, foreground: foreground);
+        await _handleConnect(
+          message,
+          foreground: foreground,
+          notificationsEnabled: notificationsEnabled,
+        );
         break;
       case PushKind.nextcloud:
         await _handleNextcloud(
           data,
           foreground: foreground,
           openChatToken: openChatToken,
+          notificationsEnabled: notificationsEnabled,
         );
         break;
       case PushKind.unknown:
@@ -96,7 +105,11 @@ class PushMessageHandler {
   Future<void> _handleConnect(
     RemoteMessage message, {
     required bool foreground,
+    required bool notificationsEnabled,
   }) async {
+    // Connect pushes carry no silent side effects, so nothing to do when the
+    // user has notifications off.
+    if (!notificationsEnabled) return;
     // On iOS the alert is delivered natively by the system; only Android needs
     // to render the plaintext payload locally.
     final data = message.data;
@@ -114,6 +127,7 @@ class PushMessageHandler {
     Map<String, dynamic> data, {
     required bool foreground,
     required String? openChatToken,
+    required bool notificationsEnabled,
   }) async {
     final subjectBase64 = data['subject'] as String;
     final signatureBase64 = data['signature'] as String;
@@ -153,6 +167,11 @@ class PushMessageHandler {
       return;
     }
 
+    // Notifications turned off: the push was still processed (deletes above,
+    // plus the foreground badge/provider refresh in NotificationController) —
+    // only the visible tray notification is suppressed.
+    if (!notificationsEnabled) return;
+
     await _renderer.render(subject);
   }